Stockholders' Equity - Components of accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	$ 1,387
Reclassification of loss (gain) to net income	(7)	$ 3
Balance at the end of period	1,362
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	(16)
Other comprehensive (loss) earnings before reclassifications	(1)
Reclassification of loss (gain) to net income	(7)
Balance at the end of period	(24)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	(2)
Balance at the end of period	(2)
Interest rate swaps.
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	21
Other comprehensive (loss) earnings before reclassifications	(1)
Reclassification of loss (gain) to net income	(7)
Balance at the end of period	13
Pension and other postretirement plan adjustments
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	(35)
Balance at the end of period	$ (35)